实现侧滑，拖拽-----百公里加速只需要三行代码
ItemTouchHelper修改源码实现非侵入式侧滑菜单，长按拖拽,百公里加速只需要三行代码
dependencies {
compile 'com.qiaomu:libitemtouchhelper:1.0.2'
}
ItemTouchHelperCallback callback = new ItemTouchHelperCallback(ItemTouchHelper.UP|ItemTouchHelper.DOWN,adapter);
ItemTouchHelper helper = new ItemTouchHelper(callback);
helper.attachToRecyclerView(recylerView);
当只有一个删除按钮的时候，滑动列表，手一放开，就自动还原了，点击不了删除
== 意思是包含内容，同时只有一个侧滑删除的按钮。
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